What does the function f: x ↦ y mean? - Mathematics Stack Exchange
Apr 20, 2016 · So, $↦$ is really just the math operator/binder $λ$, in disguise. Thus, one might just as well write $ (x ↦ x^2) (3) = 3^2 = 9$, denoting the function directly rather than through a level of …
notation - What does := mean? - Mathematics Stack Exchange
Mar 5, 2011 · What does := mean?where we are saying that the two sides are equal, but we are not defining "1" to be the expression " sin2(θ) +cos2(θ) sin 2 (θ) + cos 2 (θ) ". Basically, some people …
What does each mean in a math word problem? - Answers
Feb 11, 2025 · "Each" in a math word problem simply means every individual item or person in a group. So if you have 5 apples and you want to divide them equally among 2 people, each person would get …
What does "∈" mean? - Mathematics Stack Exchange
Jun 25, 2014 · I have started seeing the "∈" symbol in math. What exactly does it mean? I have tried googling it but google takes the symbol out of the search.
What does a zero with a diagonal line through it mean?
Apr 12, 2025 · A zero with a diagonal line through it, often represented as "Ø," typically denotes a null or empty value in various contexts, such as mathematics and computer science. It can also signify a …
What does a line on top of a number mean? - Answers
Jun 25, 2025 · A line on top of a number typically indicates a repeating decimal in mathematics. For example, (0.\\overline{3}) means that the digit 3 repeats indefinitely, representing the value (0.333...). …
What exactly does undefined mean? - Mathematics Stack Exchange
Sep 3, 2022 · Now, what exactly does undefined mean? Because I've also noticed that most mathematicians tend to use "undefined" when interpreting a value that is approaching both infinity …
Difference between "≈", "≃", and "≅" - Mathematics Stack Exchange
In mathematical notation, what are the usage differences between the various approximately-equal signs "≈", "≃", and "≅"? The Unicode standard lists all of them inside the Mathematical Operators B...
When saying how much more does it mean add or subtract?
Feb 6, 2025 · In a math operation, when you see the words difference, how much more, or exceed these all mean you need to subtract. Okay. You would subtract because if a problem asks you Jill walk 0.5 …
What does the symbol O with a vertical line through it mean?
Mar 27, 2025 · The symbol "Ø" (the letter O with a vertical line through it) typically represents the concept of "empty set" in mathematics, indicating a set that contains no elements. It can also denote …